134 Bulletin American Musetun of Natural History. [Vol. XIV, 



Measurements ' : 



„ ( Antero-posterior 32 



Diameters p- -^ 



( Transverse 30 



P^lTr 



Antero-posterior 29 



ransverse 29 



, ( Antero-posterior 26 



mi \ ^ 



( Transverse 29 



,, 3 ( Antero-posterior 27 



( Transverse 27.5 



3 ( Antero-posterior 34 



{ Transverse 25 



The Port Kennedy specimens seem to represent two distinct 

 species as suggested by Cope; however, it seems highly improb- 

 able that either bears any close relationship with the South Caro- 

 lina species, E. fraternus, which is one of the smallest American 

 species, while E. pectinatus is large, comparing in size with E. 

 complicatus or E. scotti. The teeth of the type specimen are 

 much worn, yet they show an unusual degree of complication in 

 the enamel foldings (see Fig. 23 ). As pointed out by Cope the 

 protocones of the type specimen are unusually small. The skull 

 characters are not known and until they can be made out this 

 species cannot be clearly defined, Leidy described and figured 

 some teeth from Illinois'- (see Fig. 24) which he referred to E. 

 complicatus^ but which seem to agree more closely with E. 

 pectinatus. 



The other Port Kennedy teeth described by Cope and identi- 

 fied with E. f. fratcrnus seem not to differ essentially from E. 

 complicatus although they are somewhat smaller, 



(25) Equus scotti Gidley. 



Type Locality. — Rock Creek, Brisco Co., Texas. 



Horizon. — Sheridan Beds. 



Type. — Part of a skeleton (No. 10,606), including the skull and lower jaws, 

 all the cervical and the three anterior dorsal vertebrse, both fore limbs and feet 

 complete, one hind limb and foot complete, and several dorsal and lumbar 

 vertebrae and ribs probably belonging with it. 



Author's descriptiofi. — Compared with E. caballus : (i) The skull is rela- 

 tively larger, (2) the teeth are relatively larger compared with the skull, (3) the 

 neck is shorter, (4) the body is longer, (5) the limbs are shorter and more 



' The measurements given by Cope include cement, hence the writer has carefully remeas- 

 ured the teeth and substitutes here these measurements for those given by Cope. 

 I, Trans. Wagner Free Inst., Phil. Vol. II, i88g, p. 39. 



